Question

I have a Game model that have many Organizer models attached to it. Here are my models:

public class Organizer
{
    public int ID { get; set; }
    public string Name { get; set; }
    public List<Game> Games {get; set; }
}

public class Game
{
    public int ID { get; set; }
    public string Name { get; set;}
    public List<Organizer> Organizers { get; set; }
}

I’m trying to grab all the Games that contain a specific Organizer. For instance, I might have some data like this:

Game
ID    Name
--    ----
1     Soccer
2     Baseball

Organizer
ID    Name
--    ----
1     John
2     Barry

GameOrganizer
GameID    OrganizerID
------    -----------
1         1
2         1

And here’s the code I try to use:

Organizer thisOrganizer = db.Organizers.Single(o => o.ID == 1);

var gamesQuery = db.Games
    .Where(game => game.Organizers.Contains(thisOrganizer))
    .Select(g => new { ID = g.ID, Name = g.Name });

This gives me an error:

Only primitive types are supported in this context.

I understand what it means, but I can’t figure out how to express it in a different way. The closest I’ve come is:

var gamesQuery = db.Games
    .Where(game => game.Organizers
        .Any(gO => gO.ID == 1));

but that just returns nothing. I’ve looked everywhere but everything deals with string arrays that are already known in advance.

So, how can I express this without model objects?

Answer 1

You need to declare also Games as (navigation) property of Organizer, then it will be just:

db.Organizers.Single(o => o.ID == 1).Games;